User manual

Science Manual – Using Video Images for Fisheries Monitoring 39
• Channel to extend to the top of the fish pass wall.
• Removable flanges (100 mm long and 20 mm wide) to be bolted to either side of
camera channel at the bottom, to fix light panel or polypropylene board in position
(Figure A1.19A1.2).
Perspex sheet design to fix the light panel
Light panels to be fixed down by attaching counter-sunk (at bottom edge) flanges to
the Perspex sheets. Using coach bolts with the head on the river side will mean that
no turbulence will ensue from the bolts. Some form of fixing will be needed over the
Perspex sheet slots to ensure that they cannot ride up, and this could be something
that covers the top of the camera slot. This means that the light board shape remains
standard and simple, and it is a simple approach easily fabricated.
Camera mount
• It is recommended that the camera mount is constructed from Kee Systems
(www.keesystems.com
) Kee Klamp range of products.
• A vertical pole (size 6) to be bolted to a plate on the side wall of the camera
channel using a Type 70 “rail support” (size 6) clamp. This must be easy to
remove and attach as necessary whilst setting up cameras (Figure 20.3).
• The vertical pole to slot over a spike in the bottom of the camera channel, to hold
it in place (Figure 20.3).
• Camera contained within a Type 16 “clamp-on tee” (size 6) clamp (Figure
21A1.4). Depending on what make of camera is being used, it may be necessary
to pad camera out with rubber to ensure good fit within the clamp. Check camera
fits before installation.
• The clamp containing the camera to be attached to the vertical scaffold pole
using a Type 114 swivel tee (Figure 21). This will allow the camera to be aimed
up and down.
• Measurements provided in Figure 22 must be checked to ensure that, once in
place, the camera is in the centre of the channel and that the channel walls are
not within the field of view. If different clamps and poles other than those
recommended are used, then the measurements in Figure 225 will change.
Stop log grooves
Stop log grooves (100 mm x 100 mm) situated on either side of the
lighting/polypropylene board to allow isolation of the panels and camera chamber for
work and maintenance.
Water velocity in upstream exit channel
Maintain water velocity of 0.5 ms
-1
(coarse fish) to 1.0 ms
-1
(salmonids) to deter fish
holding in the upstream exit channel.